1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Terminal Velocity

  1. Nov 11, 2007 #1
    A 1.5-mm-diameter steel ball bearing (7830 kg/m^3) is dropped into a tank of SAE 30 oil. What is its terminal velocity?

    The density of oil is 917kg/m^3, and the viscosity of oil is 0.26kg/(m*s).

    Help is much appreciated!
     
  2. jcsd
  3. Nov 11, 2007 #2
    What have you tried so far?

    Where are you stuck?
     
  4. Nov 11, 2007 #3
    Force of drag = 1/2 * (density of fluid) * (area of sphere) * v^2 * (coefficient of drag)
    Force of drag = 3 * pi * (coefficient of fluid) * (diameter of obj) * v

    Coefficient of drag = 24 / (Reynolds number)

    Reynolds number = (density of fluid * velocity of fluid * chracteristic length)/(viscosity of fluid)

    When I combine the equations, v cancels out so I cannot solve for it. Is there another equation I should be using?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Terminal Velocity
  1. Terminal Velocity (Replies: 3)

Loading...